Francesco staropoli and marco basaglia

ABSTRACT

Under-wing pylon for an aircraft comprising on the upper side means ( 2 ) for attaching to the fuselage or to the wings of the aircraft itself, means ( 3 ) for connecting the pylon to the aircraft adapted to provide special interfaces of the installed systems, said pylon having an extended shape. 
     The pylon has a monolithic framework made through a stratification of carbon fibres, unidirectional and/or woven, impregnated with epoxy resin.

The present invention refers to an under-wing pylon made of composite material.

In particular, the present invention regards an under-wing pylon made of composite material adapted to allow transport of various types of loads, attached under the wing or fuselage of an aircraft.

Known to the prior art are under-wing pylons for aircrafts comprising assembly of metal parts with parts made of composite material. For example, the U.S. Pat. No. 4,491,292 describes a device for attaching one or more loads under an aircraft whose structure is basically made of a hollow beam made up of one or more simple shaped elements made of fibreglass or other similar composite material and by metal elements coupled with elements made of composite material to provide the beam-aircraft and beam-load connection to be transported.

The applicant observed that such under-wing pylons of the prior art actually being made both of metal and composite metal could have implementation impossibilities due to the criticality of making a structure assembled using various parts, with the structural capacity required to transport substantial loads, in compliance with the dimensional restrictions of the external aerodynamic surface and the overall dimensions of the internal installations.

The applicant proposes an under-wing pylon with the main objective of reducing the weight while increasing the rigidity with respect to the solutions of the known type. In particular, the under-wing pylon according to the present invention is made through a monolithic structure integrally manufactured using composite material.

An aspect of the present invention regards an under-wing pylon for an aircraft comprising on its upper side means for attaching to the fuselage or the wings of the aircraft itself, means of connection of the pylon with the aircraft adapted to provide special interfaces for the installed systems, said pylon having an extended shape, characterised in that it comprises a monolithic framework made through a stratification of carbon fibres, unidirectional and/or woven, impregnated with epoxy resin.

Further objectives and advantages of the present invention shall be clear from the following description and from the annexed drawings, strictly provided for exemplifying and non-limiting purposes, wherein:

FIG. 1 is a schematic perspective view of the pylon of an aircraft according to the present invention.

Referring to the abovementioned FIGURES, the pylon according to the present invention has, on its upper surface, means for attaching to the fuselage or to the wings of the aircraft comprising two points of constraint, the main of which is a coupling pin 2 and the second is a secondary pin 21. In addition, provided on the upper surface of the pylon are means of connection 3 of the same to the aircraft adapted to provide special interfaces of the installed systems.

The pylon has an extended shape and in particular comprises an aerodynamic shaped nose 4 and a tail 5. Between the nose and the tail there is a central portion which represents the main structure of the pylon 6.

The means for attaching the pylon to the fuselage or to the wings of the aircraft are arranged on the upper part with the main constraint generally in proximity to the nose, while the transportable loads are attached to the lower part of the pylon itself. The pylon is made in a monolithic framework obtained by means of stratification of carbon fibres, unidirectional and/or woven, impregnated with epoxy resin.

Such pylon is advantageously obtained through lamination on a female mould, divided into two half-moulds, with the interposition, during the laying operation, of inserts made of synthetic and/or metal material and of transverse septa made of CFC (Carbon Fibre Composite) already polymerised, used as support for the final lamination.

Polymerisation is performed in an autoclave preferably at a temperature around 180° C. and a pressure amounting to 6 bars for example. Finishing operations (drilling and contouring) are performed subsequently. 

1. Under-wing pylon for an aircraft comprising on the upper side means (2) for attaching to the fuselage or to the wings of the aircraft itself, means (3) for connecting the pylon with the aircraft adapted to provide special interfaces of the installed systems, said pylon having an extended shape, characterised in that it comprises a monolithic framework integrally manufactured using composite material.
 2. Pylon according to claim 1, comprising an aerodynamic shaped nose (4) and a tail (5), between the nose and the tail there being the primary structure (6) of the pylon.
 3. Pylon according to claim 2, wherein the means for attaching to the fuselage or to the wings of the aircraft are arranged on the upper part with the main constraint generally in proximity to the nose, while the transportable loads are attached to the lower part of the pylon itself.
 4. Pylon according to claim 1, wherein such means for attaching to the fuselage or to the wings of the aircraft comprise two points of constraint of which the main one is a coupling pin.
 5. Pylon according to claim 1, made trough a stratification of carbon fibres, unidirectional and/or woven, impregnated with resin. 